str1 = '111'
print(str1)
str2 = "222"
str3 = '''333
444
555
666
'''

print('{0}---{1}---{2}'.format(1, 2, 3))
str4 = '666'
print(f'这个程序{str4}')

for i in range(1, 10):
    for j in range(1, i+1):
        print(f'{i}*{j}={i*j}\t',end='')
    print()

sep = ','
print(sep.join(str4))

str5 = 'good good study'

print("good".center(30, '*'))

for i in str5:
    print(i, end='')
